Menstruation is part of the meanstrual cycle. In the first phase of the cylce, the lining of the uterus (or endometrium) undergoes rapid proliferation of cells in preparation for pregnancy. Then, through the cycle an ovum (egg) is released from an ovary. If, while passing through the fallopian tube, the ovum is not fertilized by a sperm, this tissue and blood are shed. This discharge is called menstruation, which occurs about every 28 days. The process continues monthly until pregnancy occurs or ovulation ceases at menopause.
Nowdays, a girl can be early menstruated at the age of 9-10 years old, but it should normally happen when reaching 12 years old. Female adolescents need to pay attention on hygiene during their periods lasting for about 4-7 days per month, by often changing the protection, at least 3 times a day.
During menstruation, but also before and after them, some girl can feel unstable, uncomfortable or have pain below the navel. They can be easily tired during this time. Those signs are quite common among women and are normal
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